Subject	ionization energy
Predicate	vary across
Object	period
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.8274
Neighborhood Sigma	0.8800
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source ionization energy vary across a period 4 Google Autocomplete ionization energy vary across period 2 Google Autocomplete the ionization energy vary across a period 1 Google Autocomplete ionization energy vary down the group and across a period 1 Google Autocomplete